You can't
At least postflop I'd play it like you did, if CO wasn't bluffing you're most likely no good from the turn onward, and even if you have, worse hands can't really call you.

That said I barely ever call 4-bets out of position with AKo even slightly deep, if he min4bet gives me the creeps i'm folding, otherwise i'm still 5-betting with the intention of getting it in in that steal/resteal spot against a player who seems reasonably aggressive so far.